Occupant monitoring systems and methods

ABSTRACT

Various implementations relate to an operator monitoring system (OMS). Certain implementations include an OMS coupled to a rotatable portion of a steering wheel assembly of a vehicle. For example, the OMS may include an imaging unit, such as a camera, that is coupled to a central hub portion of the steering wheel assembly. The imaging unit has a field of view directed toward one or more occupants in the vehicle and is configured to capture an image signal corresponding to an imaging area in the field of view. The imaging area can be configured to encapsulate an expected position of one or more vehicle occupants. The OMS also includes one or more processing units in electrical communication with the imaging unit that receives and processes the image signal from the imaging unit to determine an occupant state and, in some implementations, provide feedback based on the determined occupant state.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. patent application Ser. No. 14/586,124, entitled “Occupant Monitoring Systems and Methods,” filed Dec. 30, 2014, issued as U.S. Pat. No. 9,533,687, the content of which is herein incorporated by reference in its entirety.

TECHNICAL FIELD

This disclosure generally relates to an occupant monitoring system. More specifically, this disclosure relates to a vehicle steering assembly including an occupant monitoring system.

BACKGROUND

Various advanced driver assistance systems incorporate visual, acoustic, and/or sensor warnings. Many of these warnings are in response to outside dangers (e.g., proximity of another object). However, in recent times, the number of potential distractions for a driver has increased (e.g., mobile phones, mp3 players, internal displays, etc.). Driver monitoring systems are becoming more and more popular for inclusion in vehicles, such as, to warn when the driver is detected to be in a non-alert state.

SUMMARY

Presented are systems and methods for an occupant monitoring system (OMS). For example, in various implementations, the OMS includes an imaging unit, such as a camera, that is coupled to a rotating portion of a steering wheel assembly, such as the central hub portion. The imaging unit has a field of view directed toward a cabin of the vehicle, such as in the direction of one or more occupants in the vehicle, and is configured to capture an image signal corresponding to an imaging area in the field of view. The imaging area can be configured to encapsulate an expected position of the occupant, for example. The OMS also includes one or more processing units in electrical communication with the imaging unit that receives and processes the image signal from the imaging unit to determine an occupant state and, in some implementations, provide feedback (e.g., output) based on the determined occupant state.

For example, in various implementations, an occupant monitoring system (OMS) for monitoring at least one occupant in a vehicle includes an imaging unit configured to be coupled to a steering wheel assembly. The imaging unit is configured to rotate with a central portion of the steering wheel assembly of the vehicle. The imaging unit has a field of view inside of the vehicle and is configured to capture an image signal corresponding to an imaging area in the vehicle. The imaging area is within the field of view of the imaging unit and encapsulates an expected position of the occupant in the vehicle.

In some implementations, the imaging unit may be coupled to the central portion of the steering wheel assembly, and the central portion of the steering wheel assembly may include a hub. In some implementations, the hub may include a housing. And, the imaging unit may be disposed within the housing. In certain implementations, the housing may be coupled adjacent to a backcover of the hub. For example, the housing may be coupled adjacent to the backcover via a mounting bracket or directly to the back cover. In addition, the system may also include at least one light source disposed adjacent the imaging unit in the housing, and at least a portion of the heat generated by the light source and/or the imaging unit may be transferred from the housing to the hub. In some implementations, the housing may be integrally formed with a backcover of the hub, and in some implementations, the housing may be separately formed and attached to the backcover of the hub using suitable fastening mechanisms.

In certain implementations, the OMS further includes a steering angle sensor. In addition, the OMS may also include a processing unit. The processing unit includes a processor and a memory operably coupled to the processor. According to some implementations, the memory has computer-executable instructions stored thereon that, when executed by the processor, cause the processor to: (1) receive an electrical signal from the steering angle sensor; (2) process the electrical signal to determine at least one of the angle of rotation of the steering wheel assembly and the rate of angular rotation of the steering wheel assembly; and (3) adjust the imaging unit to correct for at least one of the angle of rotation of the steering wheel assembly and the rate of angular rotation of the steering wheel assembly.

According to other implementations, the memory of the processing unit has computer-executable instructions stored thereon that, when executed by the processor, cause the processor to: (1) receive an electrical signal from the steering angle sensor; (2) process the electrical signal to determine at least one of the angle of rotation of the steering wheel assembly and the rate of angular rotation of the steering wheel assembly; and (3) adjust the image signal captured of the imaging area to correct for at least one of the angle of rotation of the steering wheel assembly and the rate of angular rotation of the steering wheel assembly.

The OMS may also include a single modular unit configured to be coupled to the steering wheel assembly, according to certain implementations.

In various implementations, the imaging unit may include at least one camera. The OMS may also include at least one light source configured to illuminate the imaging area. For example, in some implementations, the camera is an infrared camera, and the light source includes an infrared light source, such as, for example, at least one light emitting diode. The light source may also include a light bar that includes one or more light emitting diodes.

In some implementations, the light source includes at least a first section of one or more light emitting diodes and a second section of one or more light emitting diodes. The first section is configured to illuminate visible light in response to the OMS being in one of an operational mode or a non-operational mode, and the second section is configured to illuminate infrared light in the direction of the field of view of the imaging unit. In other implementations, other types of light sources may be used, a light bar including at least two sections of light sources, two or more light bars, or a combination thereof may be used.

In certain implementations, the memory may have computer-executable instructions stored thereon that, when executed by the processor, cause the processor to: (1) receive an image signal from the imaging unit; (2) process the image signal to identify an analysis region; (3) analyze the analysis region to determine an occupant information parameter; (4) analyze the occupant information parameter to determine an occupant state; and (5) output a signal based on the determined occupant state. In some implementations, the analysis region includes determining the position and/or orientation of the occupant's head and/or eyes. In addition, in some implementations, analyzing the analysis region includes determining deviation in the position and/or orientation of the occupant's head and/or eyes from a predetermined position. Furthermore, in some implementations, analyzing the occupant information parameter to determine the occupant state includes determining that the position and/or orientation of the occupant's head and/or eyes are deviated from a predetermined position for at least a predetermined amount of time.

The OMS may also include a disabling unit configured to temporarily disable the occupant monitoring system when a driver signal is received and the vehicle is stationary, according to certain implementations. For example, the driver signal may be output upon rotation of the steering wheel assembly of the vehicle by at least a predetermined amount and/or for a predetermined amount of time. And, the driver signal may cease to be output when the steering wheel assembly is returned to a substantially central position for at least a predetermined amount of time.

Various implementations of the OMS may also include a steering wheel assembly configured to be rotatably coupled to a steering column of the vehicle. The steering wheel assembly includes a rim surrounding the centrally located hub, and the imaging unit is configured to be coupled to and rotate with the central portion of the steering wheel assembly.

Various implementations also include a method of monitoring an occupant in a vehicle using an occupant monitoring system. The method includes: (1) coupling an occupant monitoring system (OMS) to a rotatable portion of a steering wheel assembly of the vehicle such that the OMS rotates with the rotatable portion, the OMS including an imaging unit configured to capture an image signal corresponding to an imaging area in the vehicle, the imaging area being within the field of view of the imaging unit; (2) capturing an image signal corresponding to the imaging area in the vehicle; (3) processing the image signal to identify an analysis region; (4) analyzing the analysis region to determine an occupant information parameter; (5) analyzing the occupant information parameter to determine an occupant state; and (6) outputting a signal based on the determined occupant state.

In some implementations, the rotatable portion of the steering wheel assembly of the vehicle is configured to rotate relative to a steering column. Furthermore, the OMS may also include at least one processing unit, and one or more of the processing, analyzing, and outputting steps may be performed by the OMS processing unit. The vehicle may also include at least one processing unit, and one or more of the processing, analyzing, and outputting steps may be performed by the vehicle processing unit.

The details of one or more implementations of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims.

DESCRIPTION OF DRAWINGS

The device is explained in even greater detail in the following drawings. The drawings are merely exemplary to illustrate the structure of preferred devices and certain features that may be used singularly or in combination with other features. The invention should not be limited to the examples shown.

FIGS. 1A and 1B are schematic views of exemplary occupant monitoring systems;

FIGS. 2A-F are schematic views of exemplary imaging units;

FIGS. 3A and 3B are schematic views of exemplary occupant monitoring systems;

FIGS. 4A-D are schematic views of exemplary occupant monitoring systems; and

FIG. 5 is a schematic view of an exemplary processing unit.

FIG. 6 is a front view of a steering wheel according to one implementation.

FIG. 7 is a side cut out view of the clock spring shown in FIG. 4 as viewed along the C-C line.

FIG. 8 is a perspective view of a wire ribbon according to one implementation.

FIG. 9 is a side cut out view of a clock spring according to another implementation.

FIG. 10 is a schematic view of various components of the OMS according to one implementation.

FIGS. 11A and 11B illustrate a slip ring according to one implementation.

FIG. 12 is a perspective view of various components of the OMS, including the lens, assembled together, according to one implementation.

FIG. 13A is a perspective, exploded front view of the OMS shown in FIG. 12.

FIG. 13B is a perspective, exploded rear view of the OMS shown in FIG. 12.

FIG. 14 is a perspective, assembled front view of the OMS shown in FIG. 12 without the lens.

FIG. 15 is a schematic, top view of certain components of the OMS shown in FIG. 12.

FIG. 16 is a spectral transmission curve showing the percent of light transmitted at various wavelengths through an ACRYLITE lens, according to one implementation.

FIGS. 17A and 17B are front perspective and rear views, respectively, of a housing according to one implementation.

FIGS. 18A and 18B are front perspective and rear views, respectively, of a housing according to another implementation.

FIGS. 19A and 19B are front perspective and rear views, respectively, of a housing according to yet another implementation.

FIG. 20 is a top view of the steering wheel assembly and the housing shown in FIG. 12 coupled thereto, according to one implementation.

Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION

Certain exemplary implementations of the invention will now be described with reference to the drawings. In general, such implementations relate to an occupant monitoring system (OMS) for monitoring occupants in a vehicle via one or more imaging units. For example, in various implementations, the OMS includes an imaging unit, such as a camera, that is coupled to a rotating portion of a steering wheel assembly, such as the central hub portion. The imaging unit has a field of view directed toward one or more occupants in the vehicle and is configured to capture an image signal corresponding to an imaging area in the field of view. The imaging area can be configured to encapsulate an expected position of the occupant, for example. The OMS also includes one or more processing units in electrical communication with the imaging unit that receives and processes the image signal from the imaging unit to determine an occupant state and, in some implementations, provide feedback (e.g., output) based on the determined occupant state.

FIG. 1A is a schematic view of an exemplary occupant monitoring system (OMS) 100 for monitoring a driver 102 in a vehicle. In this implementation, the OMS 100 may be coupled to the vehicle's steering wheel assembly 104. The OMS 100 and/or the steering wheel assembly 104 can be configured to rotate relative to the vehicle's steering column 106. The steering wheel assembly 104 can be coupled to the vehicle's steering input shaft 107, steering column 106, or any other vehicle component used to translate driver input to control instructions for the vehicle (e.g., including drive by wire technology). For example, as illustrated in FIG. 1A, the steering wheel assembly 104 can be coupled to the vehicle's steering input shaft 107 that is in turn coupled to the vehicle's steering column 106. The steering column 106 can be a non-rotating, component within the vehicle. In some implementations, the steering column 106 may include a tilt and/or extension mechanism (e.g., a telescopic mechanism) that allows for the adjustment of the steering wheel assembly 104 closer to, away from, or at a different angle relative to the driver. The tilt/extension mechanism may be referred to as “tilt and telescope” or “reach and rake,” for example.

In some implementations, the steering column 106 can receive the steering shaft 107 that extends along a steering axis and serves to translate rotational movement of the steering wheel assembly 104 to the wheels of the vehicle. Rotational movement of the steering wheel assembly 104 can be transmitted to the wheels by mechanical and/or electrical means.

As illustrated in the exemplary system shown in FIG. 1B, the steering wheel assembly 104 includes a rim 114 and a hub 116. The steering wheel assembly 104 can also include at least one spoke 118 connecting the rim 114 to the hub 116. The rim 114 can comprise a single continuous portion or any number of unique sections that the driver can grip to facilitate control of the vehicle. For example, the rim 114 can include an annular ring shape with an outer contour that is essentially circular in shape. In alternate implementations, the rim 114 can define any suitable shape including, for example, circular, elliptical, square, rectangular, semi-circular, semi-elliptical, or any other regular or irregular shape. In addition, in some implementations, the rim may include two or more semi-circular, semi-elliptical, semi-rectangular, or other regular or irregular shaped portions coupled to the hub. For example, in one implementation, the rim may include two semi-circular rim sections coupled to the hub (e.g., resembling a flight yoke). The hub 116 can be disposed central to the rim 114. The hub 116 can provide the connection point between the steering wheel assembly 104 and the vehicle's steering shaft 107/steering column 106.

As illustrated in implementations shown in FIGS. 1A and 1B, the OMS 100 is coupled to a central portion 112 of the steering wheel assembly 104. The central portion 112 can include, for example, the spoke 118, the hub 116, and/or any other portion of the steering wheel assembly 104 centrally located with respect to the rim 114. As used herein “and/or” includes implementations having element A alone, element B alone, or elements A and B taken together. For example, the central portion 112 can include the spoke 118 and/or the hub 116 is meant to include implementations wherein the central portion 112 includes the spoke 118, the hub 116, or the spoke 118 and the hub 116.

Coupling and integrating the OMS 100 with the central portion 112 of the steering wheel assembly 104 can allow for increased viewing angles and improved resolution of the imaging area by an imaging unit 108 of the OMS 100 of the driver 102 and/or other vehicle occupant regardless of the rotation of the steering wheel assembly 104. For example, if the OMS 100 were mounted to a non-rotating component, such as the steering column 106, the OMS 100 view of the driver 102 or occupant could be obscured by the spoke(s) 118 when the steering wheel assembly 104 is rotated, or by the rim 114 by being positioned rearwards in relation to the steering wheel assembly 104. In addition, mounting the OMS 100 to a non-rotating component of the vehicle would increase the distance between the imaging unit 108 and the occupants in the vehicle.

In addition, the central portion 112 of the steering wheel assembly 104 in a vehicle can also contain an airbag. Generally, the driver knows to position his/her hands and/or body in certain positions relative to the steering wheel assembly 104 for safety due to the airbag. Coupling the OMS 100 to the central portion 112 of the steering wheel assembly 104 can also take advantage of this conditioned driver positioning and minimizes the likelihood of the driver 102 obscuring the OMS 100.

Furthermore, one or more components of the OMS 100 may be mounted to the rim 114 in some implementations. For example, as described more below, a light source for illuminating at least a portion of a field of view of the imaging unit 108 may be included in a light bar system disposed on the rim 114. However, by mounting components of the OMS 100 to the central portion 112, the OMS 100 components may be less likely to be obscured by the driver's hands during normal operation of the vehicle.

Furthermore, the three-dimensional position of the steering wheel assembly 104 in a vehicle (e.g., height, angle, tilt, etc.) is usually adjustable to accommodate a wide range of drivers and/or other vehicle occupants (e.g., drivers or occupants of varying heights, weights, proportions, ages, ethnicities, genders, experience, etc.). Incorporation of the OMS 100 into the steering wheel assembly 104 can allow for the OMS 100 to take advantage of this adjustment, and therefore accommodate a wide range of drivers and driver positions.

As noted above, the OMS 100 includes at least one imaging unit 108 configured to capture an image signal corresponding to an imaging area 110 in the vehicle. The imaging area 110 may include the field of view of the imaging unit 108 or a portion thereof. The image signal, for example, can comprise an optical representation of an instant value of the imaging area 110. In some implementations, the imaging area 110 can be configured to encapsulate an expected position of the driver 102 and/or other vehicle occupant. The imaging unit 108 can be configured for rotating with the steering wheel assembly 104 of the vehicle. In various implementations, the imaging unit 108 can be disposed on any portion of the central portion 112 of the steering wheel assembly 104.

The imaging unit 108 can include an instrument capable of capturing an image signal corresponding to the imaging area 110. For example, the imaging unit 108 can comprise a spectrometer, a photometer, a camera, or a combination thereof. In some implementations, such as in FIG. 2A, the imaging unit 108 includes a camera 120. The camera 120 can be any type of camera consistent with the systems and methods described herein. In some implementations, the camera can have a high resolution, low resolution, capable of capturing still and/or moving images. In some implementations, the camera 120 can be any suitable digital camera that can capture an image signal corresponding to the imaging area. Suitable camera platforms are known in the art and commercially available from companies such as Zeiss, Canon, Applied Spectral Imaging, and others, and such platforms are readily adaptable for use in the systems and methods described herein. In one implementation, the camera 120 may include a fish eye camera. The camera 120 can feature simultaneous or sequential capture of one or more wavelengths using either embedded optical filters within the camera 120 or external filters. The camera 120 can, in some implementations, comprise a lens (e.g., a wide angle lens, a fisheye lens, etc.), adaptive optics, other evolving optics, or a combination thereof.

In some implementations, the imaging unit 108 may be part of a vehicle occupant imaging system 109 that is part of the OMS 100. The vehicle occupant imaging system 109 can also include at least one light source 122. The light source 122 can be any type of light source capable of illuminating at least a portion of the field of view of the imaging unit 108 and/or the imaging area 110. The imaging unit 108 can comprise a single light source 122 or any number of light sources 122. Moreover, different types of light sources 122 may be implemented. In some implementations, the one or more light sources 122 can illuminate the imaging area 110 with light of different wavelengths (e.g., one light source 122 can illuminate with a different wavelength or range of wavelengths than the other light source(s) 122). Examples of suitable light sources 122 include artificial light sources such as incandescent light bulbs, light emitting diodes, and the like. Furthermore, the light source can be a continuous light source (e.g., incandescent light bulbs, light emitting diodes, continuous wave lasers, etc.), a pulsed light source (e.g., pulsed lasers), or a combination thereof. In addition, in implementations that include light sources 122 configured for illuminating with different wavelengths, such as, for example, a first light source configured for illuminating infrared light and a second light source configured for illuminating visible light, the light sources 122 having different wavelengths may be configured for performing different functions. For example, the infrared light source may be configured for illuminating at least a portion of the field of view of the imaging unit 108 and the visible light source may be configured for communicating information to the driver or other occupants.

In some embodiments, the light source 122 can be any light source that emits one or more wavelength between 300 and 2500 nm. In some embodiments, the light source 122 emits a broad range of wavelengths, and a filter can be used to select a wavelength of interest. In some embodiments, a range of wavelengths is selected. Any type of filter consistent with the systems and methods described herein can be used. For example, the filter can be an absorptive filter, a dichroic filter, a monochromatic filter, a longpass filter, a bandpass filter, a shortpass filter, or a combination thereof. In some embodiments, the filter is an external filter. In some embodiments, the filter is embedded in the light source 122. In some embodiments, the filter is embedded in the vehicle occupant imaging system 109 and/or may include at least one optical film. In some implementations, the light source 122 can emit a wavelength or range of wavelengths of interest. In some implementations, the light source 122 can emit a range of wavelengths of from 800 nm to 1000 nm. In some implementations, the light source 122 can comprise an infrared light source (e.g., a light source emitting one or more wavelengths from 750 nm to 1,000,000 nm), such as a near-infrared light source, a mid-infrared light source, a far-infrared light source, or a combination thereof.

In certain implementations, a processing unit may be configured for adjusting an intensity of the light source 122 based on ambient lighting conditions in the field of view of the imaging unit 108. For example, the intensity of light emitted from the light source 122 may be determined by the processing unit based on the image signals received from by the imaging unit 108, according to one implementation.

In some implementations, the light source 122 can include a light bar 124. The light bar 124 can include, for example, a liquid crystal display (LCD), thin-film-transistor display, active-matrix display, a segmented display (e.g., improved black nematic (INB), super twisted nematic (STN), etc.), one or more light-emitting diodes (LED), a liquid crystal display, laser, halogen, fluorescent, an infra-red (IR) LED illuminator, or any other suitable light emitting element. For example, in some implementations, the light bar 124 may include one or more LEDs that emit one or more wavelengths in the visible range (e.g., 350 nm to 750 nm). In another implementation, the light bar 124 may include one or more LEDs that emit infrared light. And, in yet another implementation, the light bar 124 may include a first set of LEDs that emit one or more wavelengths in the visible range and a second set of LEDs that emit one or more wavelengths in the infrared range. For example, in various implementations, the light bar 124 includes at least a first section of LEDs that emit visible light and at least a second section of LEDs that emit infrared light. The LEDs in the second section may be configured for illuminating at least a portion of the field of view of the imaging unit 108, and the LEDs in the first section may be configured for communicating information to the driver or other occupant. For example, in one implementation, the LEDs in the first section are configured for illuminating visible light in response to the OMS being in one of an operational mode or a non-operational mode. In another implementation, the LEDs in the first section may be configured to illuminate during vehicle operation to provide a warning to the driver or other occupants. And, in yet another implementation, the LEDs in the first section may be configured to flash one or more times at vehicle start up to indicate that the OMS is in an operational mode and then illuminate during vehicle operation to provide a warning to the driver or other occupants.

In some examples, the vehicle occupant imaging system 109 may use an external light source in addition to or instead of light source 122. As used herein, an external light source includes any light source that is not part of the OMS 100. For example, the external light source can include a natural light source, such as the sun. Other examples of external light sources include ambient light, such as from street lamps, the headlights and/or taillights from other vehicles, electronic displays within the vehicle cabin, cabin lights, etc. In some examples, the vehicle occupant imaging system 109 can use an external light source (not shown) that is electrically coupled to the vehicle occupant imaging system 109 such that the external light source is configured to illuminate the field of view of the imaging unit 108 and/or the imaging area 110.

In some implementations, the light source 122 may include the light bar 124, another light source, such as those described above, or a combination thereof.

It is to be understood that as used herein, the singular forms “a”, “an,” and “the” include the plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a camera,” “a light source,” or “a light bar” includes combinations of two or more such cameras, light sources, or light bars, and the like. The components comprising the vehicle occupant imaging system 109 can be configured in any way consistent with the systems and methods described herein.

Some exemplary configurations of the vehicle occupant imaging system 109 are illustrated in FIG. 2A-2F. In the implementation shown in FIG. 2A, the vehicle occupant imaging system 109 includes a camera 120. An external light source (not shown), such as an artificial light source, the sun or other available ambient light, is used to illuminate the field of view and/or imaging area of the camera 120.

In the implementation shown in FIG. 2B, the vehicle occupant imaging system 109 includes camera 120 and one or more light sources 122 disposed proximate and above the camera 120. In the implementation shown in FIG. 2C, the vehicle occupant imaging system 109 includes camera 120 and light bar 124 disposed proximate and above the camera 120.

In other implementations, one or more individual light sources 122 or light bars 124 (or combinations thereof) may be disposed below and/or to the sides of the camera 120 or adjacent other locations on the steering wheel assembly 104, vehicle, or vehicle occupant imaging system 109. For example, in the implementation shown in FIG. 2D, the vehicle occupant imaging system 109 includes camera 120, individual light source 122 disposed proximate and above camera 120, and light bar 124 disposed proximate and below camera 120. As another example, the vehicle occupant imaging system 109 shown in FIG. 2E includes camera 120, two individual light sources 122 disposed proximate and to the sides of camera 120, and light bar 124 disposed proximate and above the camera 120. In another example, as illustrated in FIG. 2F, the vehicle occupant imaging system 109 may include camera 120, two individual light sources 122 a, 122 b, and two light bars 124 a, 124 b. A first light source 122 a is disposed proximate to a right side of the camera 120, a second light source 122 b is disposed proximate to a left side of the camera 120, a first light bar 124 a is disposed proximate to a right side of the first light source 122 a, and a second light bar 124 b is disposed proximate to a left side of the second light source 122 b.

Any number of cameras 120, light sources 122, and/or light bar 124 combinations or configurations is contemplated.

During normal operation of a vehicle, the central portion 112 of the steering wheel assembly 104 is readily observable by the driver 102. In order for the presence of the OMS 100 to not alter the driver's normal operation of the vehicle, the OMS 100 may be coupled to the steering wheel assembly 104 so as to be non-visible or unobtrusive to the driver 102. For example, the OMS 100 can be hidden from the driver 102 behind a style element. Moreover, the position of the vehicle occupant imaging system 109 can also be optimized for safety of the driver's eyes.

For example, one or more components of the OMS 100, such as the imaging unit 108 and/or the light source 122, may be disposed within a housing. The housing can be permanently and/or removably coupled to the steering wheel assembly 104. In addition, the housing may be integrally formed with or separately formed from and mounted to the steering wheel assembly 104 according to various implementations. For example, in some implementations, the housing may be integrally formed with a backcover 126 of the hub 116, and one or more components of the OMS 100 can be disposed in the housing formed with the backcover 126. In one such implementation, the OMS 100 components disposed in the backcover 126 rotate with the steering wheel assembly 104. In other implementations, the housing may be integrally formed with a portion of the hub 116 that is adjacent to or includes a driver air bag or switch assembly. And, in other implementations, the housing may be separately formed from the steering wheel assembly 104 and coupled to it using any suitable fastening technique, such as, for example, screws, hooks, clips, adhesive (e.g., glue), soldering, or welding. The housing may be coupled directly to the steering wheel assembly 104 or to a mounting bracket, such as mounting bracket 301 described below in relation to FIGS. 12-15, or other structure that is coupled to the steering wheel assembly 104.

FIGS. 3A through 3B illustrate various implementations of the housing of the vehicle occupant imaging system 109 coupled to the steering wheel assembly 104. For example, in the implementation shown in FIG. 3A, the housing for the vehicle occupant imaging system 109 is coupled to an upper portion of the hub 116 of the steering wheel assembly 104. Components of the vehicle occupant imaging system 109 are disposed within the housing. FIG. 3B illustrates a side view of the housing for the vehicle occupant imaging system 109 that is shown in FIG. 3A. The backcover 126 to which the housing is coupled is part of the hub 116.

FIG. 4A through 4D illustrate various implementations of components of the vehicle occupant imaging system 109 coupled adjacent to the steering wheel assembly 104. In particular, FIG. 4A provides a front view of the steering wheel assembly 104 with components of the vehicle occupant imaging system 109 coupled adjacent to the backcover 126. For example, in some implementations, the components may be coupled directly to the steering wheel assembly and/or the housing noted above in FIGS. 3A and 3B. In other implementations, the components may be coupled to at least one mounting bracket or other intermediate structure(s) that is coupled directly to the steering wheel assembly and/or housing FIG. 4B provides an angled front view of the steering wheel assembly 104 with components of the vehicle occupant imaging system 109 coupled adjacent to the backcover 126. FIG. 4C provides a top-down view of the steering wheel assembly 104 with components of the vehicle occupant imaging system 109 coupled adjacent to the backcover 126. FIG. 4D provides a close up view of the section marked “4D” in FIG. 4A showing components of the vehicle occupant imaging system 109 coupled adjacent to the backcover 126. In these or other implementations, other components of the OMS 100, such as one or more processing units, may also be disposed adjacent to the steering wheel assembly, such as within the housing coupled to the backcover 126. Alternatively, the other components of the OMS 100 may be disposed on other portions of the steering wheel assembly 104 or outside of the steering wheel assembly 104 within the vehicle.

In some implementations, it may be desirable to thermally couple the OMS 100 or portions thereof to the backcover 126 and/or other portions of the steering wheel assembly 104 to dissipate heat away from the portions of the OMS 100 and allow for improved heat exchange. For example, the housing in which components of the vehicle occupant imaging system 109 are disposed may be formed of a thermally conductive material and coupled to the backcover 126 using a thermally conductive “gap pad” or other thermally conductive adhesive or mechanical heat sink, according to certain implementations. For example, the housing, backcover 126, and steering wheel assembly 104 may be constructed of materials having high thermal conductivity, including, for example, magnesium alloy (diecast) (1.575 W/cm·C°), aluminum alloy (diecast) (2.165 W/cm·C°), and steel (low carbon) (0.669 W/cm·C°).

In some implementations, the housing can be coupled to the backcover 126 or other portions of the steering wheel assembly 104 using a mounting bracket, such as shown and described below in relation to FIGS. 12 through 20, or may be directly coupled to the back cover 126 or other portions of the steering wheel assembly 104. Heat from the OMS 100 components disposed within the housing are conducted from the housing to the backcover 126 and/or the steering wheel assembly 104 directly or via the mounting bracket, allowing the back cover 126 and/or steering wheel assembly 104 to act as a heat sink for the OMS 100.

In some implementations, the OMS 100 can further include a steering angle sensor 128, as shown in FIG. 3B. The steering angle sensor 128 can be mounted proximate to the steering wheel assembly 104 and can provide active feedback about the position, angle, rate of rotation, and/or orientation of the steering wheel assembly 104. The steering angle sensor 128 may be disposed between a non-rotating and a rotating element of the steering wheel assembly 104. For example, as shown in FIG. 3B, the steering angle sensor 128 may be coupled to the steering column 106, which does not rotate. Alternatively (not shown), the steering angle sensor 128 may be coupled to the steering shaft 107, which rotates relative to the steering column 106. In another example, which is shown in FIG. 6, the steering angle sensor 128 is disposed in a stator of an automotive clock spring. Alternatively (not shown), the steering angle sensor 128 may be disposed in a rotor of the automotive clock spring.

The steering angle sensor 128 can be an analog device, a digital device, or a combination thereof. For example, the steering angle sensor 128 can include a rotating, slotted disc; an LED light; and a detector. The LED light is positioned to transmit light through the slotted disc to then be collected by the detector. The detector can output a signal based on whether or not any light is detected according to the slit position. By knowing the slit positions and counting the number of times light/no light are detected, the rotation speed and direction can be determined. The OMS 100 can utilize a dedicated steering angle sensor 128, or the OMS 100 can utilize an existing sensor integrated in the steering wheel assembly 104 and/or other vehicle component.

In various implementations, the OMS 100 is associated with control circuitry for controlling its operation. For example, the OMS 100 can be associated with circuitry for controlling operation of the vehicle occupant imaging system 109 including, for example, operation of the camera 120 and/or light source 122. In an exemplary implementation, the OMS 100 may be wired directly to the control circuitry of the steering wheel assembly 104. For example, the light source 122 can be wired through an inline resistor to a steering wheel assembly power source (not shown).

In some implementations, the OMS 100 includes a processing unit 200. The processing unit 200 can be configured to provide operation instructions to/from the vehicle and various OMS 100 components. The processing unit 200 can be configured to direct operation of the OMS 100. The processing unit 200 can be part of and disposed adjacent the vehicle occupant imaging system 109 and/or disposed on or otherwise associated with the electronic control unit (ECU) of the vehicle. In a further implementation, the processing unit 200 may be located on or otherwise associated with another vehicle system. Where the processing unit 200 is associated with a system other than the OMS 100, communication lines (i.e., data and/or power wires) may be provided between the alternate system and the OMS 100. For example, the OMS 100 may be connected to the vehicle's electronic control unit (ECU) by one or more wires extending between the ECU unit and the vehicle occupant imaging system 109 of the OMS 100. Furthermore, in certain implementations, the steering angle sensor 128 is electrically coupled to the processing unit 200.

When the logical operations described herein are implemented in software, the process may execute on any type of computing architecture or platform. For example, the functions of the OMS 100 may be implemented on any type of computing architecture or platform.

The implementation shown in FIG. 5 illustrates computing device/processing unit 200 upon which implementations disclosed herein may be implemented. The processing unit 200 can include a bus or other communication mechanism for communicating information among various components of the processing unit 200. In its most basic configuration, processing unit 200 typically includes at least one processor 202 and system memory 204. Depending on the exact configuration and type of computing device, system memory 204 may be volatile (such as random access memory (RAM)), non-volatile (such as read-only memory (ROM), flash memory, etc.), or some combination of the two. This most basic configuration is illustrated in FIG. 5 by a dashed line 206. The processor 202 may be a standard programmable processor that performs arithmetic and logic operations necessary for operation of the processing unit 200.

The processing unit 200 can have additional features/functionality. For example, the processing unit 200 may include additional storage such as removable storage 208 and non-removable storage 210 including, but not limited to, magnetic or optical disks or tapes. For example, the processing unit 200 may be configured for storing at least a portion of the image signals received to one or more of the storage 208, 210. In one implementation, the image signals (or a portion thereof) may be stored on the non-removable storage 210 so as to keep the image signals secure. In addition, the image signals may be stored and/or transmitted in full or as a set of data related to portions of the image signals, such as data related to occupant information parameters described below.

In addition, the processing unit 200 may be configured for storing feature information related to image signals captured of at least one vehicle occupants just prior to the vehicle being turned off. This feature information may be stored in a temporary memory area that may be part of storage 210, for example, or is separate from storage 210. When the vehicle is started up again, the feature information may be retrieved by the processing unit 200 to accelerate startup of the OMS 100. In some implementations, the feature information may be stored for one or more of the prior vehicle shut downs. In one implementation, storing feature information for several of the prior vehicle shut downs increases the likelihood that the feature information stored includes information related to the at least one of the occupants in the vehicle at the next start up.

The processing unit 200 can also contain network connection(s) via a network interface controller 216 that allow the device to communicate with other devices. The processing unit 200 can also have input device(s) 214 such as a keyboard, mouse, touch screen, antenna or other systems configured to communicate with the OMS 100, imaging unit 108, light source 122, and/or steering angle sensor 128 in the system described above, etc. Output device(s) 212 such as a display, speakers, printer, etc. may also be included. The additional devices can be connected to the bus in order to facilitate communication of data among the components of the processing unit 200.

The processor 202 can be configured to execute program code encoded in tangible, computer-readable media. Computer-readable media refers to any media that is capable of providing data that causes the processing unit 200 (i.e., a machine) to operate in a particular fashion. Various computer-readable media can be utilized to provide instructions to the processor 202 for execution. Common forms of computer-readable media include, for example, magnetic media, optical media, physical media, memory chips or cartridges, a carrier wave, or any other medium from which a computer can read. Example computer-readable media can include, but is not limited to, volatile media, non-volatile media and transmission media. Volatile and non-volatile media can be implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data and common forms are discussed in detail below. Transmission media can include coaxial cables, copper wires and/or fiber optic cables, as well as acoustic or light waves, such as those generated during radio-wave and infra-red data communication. Example tangible, computer-readable recording media include, but are not limited to, an integrated circuit (e.g., field-programmable gate array or application-specific IC), a hard disk, an optical disk, a magneto-optical disk, a floppy disk, a magnetic tape, a holographic storage medium, a solid-state device, RAM, ROM, electrically erasable program read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices.

In an exemplary implementation, the processor 202 can execute program code stored in the system memory 204. For example, the bus can carry data to the system memory 204, from which the processor 202 receives and executes instructions. The data received by the system memory 204 can optionally be stored on the removable storage 208 or the non-removable storage 210 before or after execution by the processor 202.

The processing unit 200 typically includes a variety of computer-readable media. Computer-readable media can be any available media that can be accessed by the processing unit (200) and includes both volatile and non-volatile media, removable and non-removable media. Computer storage media include volatile and non-volatile, and removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. System memory 204, removable storage 208, and non-removable storage 210 are all examples of computer storage media. Computer storage media include, but are not limited to, RAM, ROM, electrically erasable program read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by the processing unit 200. Any such computer storage media can be part of the processing unit 200.

It should be understood that the various techniques described herein can be implemented in connection with hardware or software or, where appropriate, with a combination thereof. Thus, the methods, systems, and associated signal processing of the presently disclosed subject matter, or certain aspects or portions thereof, can take the form of program code (i.e., instructions) embodied in tangible media, such as floppy diskettes, CD-ROMs, hard drives, or any other machine-readable storage medium wherein, when the program code is loaded into and executed by a machine, such as a computing device, the machine becomes an apparatus for practicing the presently disclosed subject matter. In the case of program code execution on programmable computers, the computing device generally includes a processor, a storage medium readable by the processor (including volatile and non-volatile memory and/or storage elements), at least one input device, and at least one output device. One or more programs can implement or utilize the processes described in connection with the presently disclosed subject matter, e.g., through the use of an application programming interface (API), reusable controls, or the like. Such programs can be implemented in a high level procedural or object-oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language can be a compiled or interpreted language and it may be combined with hardware implementations.

In some implementations, the system memory 204 includes computer-executable instructions stored thereon that, when executed by the processor 202, can be used to direct operation of the OMS 100 to monitor the driver (e.g., capture an image of the driver), determine a driver state, and provide an output signal based on the determined driver state. For example, the processor 202 can direct operation of the imaging unit 108 and/or the light source 122. In particular, the imaging unit 108 can be directed to capture an image of the imaging area 110 and output the captured image signal to the processor 202. The imaging unit 108 may also be configured for communicating data associated with the image signal to the processor 202. The processor 202 can analyze the image signal from the imaging unit 108 to determine information about the operator state and/or identify portions of the image signal that may provide information about the operator state.

In other implementations, the processor 202 may communicate all or a portion of the image signal and/or calculated data based on all or a portion of the image signal to another processor(s) disposed remotely from processor 202. The other processor may be configured for using the received image signal (or portions thereof) or data to determine a driver or occupant state.

For example, the processor 202 can receive the image signal from the imaging unit 108 and process the image signal to identify an analysis region. The analysis region can be a region of the imaging area 110 associated with the driver, non-driving vehicle occupant and/or other region of interest within or external to the vehicle. Identifying the analysis region can comprise determining the position and/or orientation of the driver's head and/or eyes. The analysis region can comprise the determined position of the driver's head and/or eyes.

The analysis region can be analyzed by the processor 202 (or another processor) to determine an occupant information parameter. The occupant information parameter can include, for example, information about the occupant corresponding to the occupant's alertness and/or attention or a state of the occupant or vehicle that would prevent the imaging unit 108 from capturing relevant data associated with the occupant. The occupant information parameter can include the position and/or orientation (e.g., yaw, pitch, roll) of the occupant's head, the rate of movement of the occupant's head, the dimensions of the occupant's head, determination if the occupant is wearing a certain article that can affect the image signal (e.g., a hat, glasses, sunglass, contact lenses, makeup, jewelry, etc.), movement of the occupant's mouth (e.g., determining if the occupant is talking, yawning, singing, sneezing, etc.), movement of the occupant's nose (e.g., determining if the occupant is breathing, sneezing, etc.), movement of the occupant's eyes (e.g., squinting, blinking, blink rate, saccades, smooth pursuit movements, vergence movements, vestibule-ocular movements, etc.), movement and/or position of the occupant's eye lids, gaze vector, heart rate, workload, occupant identification features, occupant age estimates, facial musculature movements (e.g., movements associated with expression, pain, squinting, blinking, talking, sneezing, singing, sleeping, physical impairment, etc.), and/or the position and/or orientation of the occupant's eyes. Accordingly, the analysis region can be analyzed to determine a deviation in the position and/or orientation of the occupant's head and/or eyes from a predetermined position.

One or more of the occupant information parameters can be analyzed to determine an occupant state. The occupant state can include, for example, whether the occupant's eyes are open or closed, whether or not the occupant is looking at the road, the center console, or elsewhere, whether or not the occupant is distracted, the relative alertness of the occupant, the occupant's emotion(s) (e.g., angry, sad, happy, excited, nervous, afraid, etc.), the occupant's physical condition (e.g., sleepy, hungry, ill, impaired, etc.), and/or the occupant's demeanor (e.g., posture, eating, drinking, giving verbal commands, completing manual tasks, direction of eye gaze, interested, etc.), and the like. Accordingly, analyzing the occupant information parameter to determine the occupant state can include determining that the position and/or orientation of the occupant head and/or eyes are deviated from a predetermined position. Analyzing the occupant information parameter may also include determining that the position and/or orientation of the occupant head and/or eyes are deviated from the predetermined position for at least a predetermined amount of time. Other examples include, assessing the occupant's visual distraction level (e.g., occupant state) through monitoring the occupant's eye/pupil vectors relative to the position of the windshield (e.g., occupant information parameter). Features of the mouth, such as corners and average separation of the lips, can be monitored to determine when a particular occupant is speaking, and audio signals captured in the vehicle may be correlated with the mouth features by a speech recognition system (e.g., such as used in hand's free processing systems) to filter out speech from unintended occupants and/or background noise. Monitoring the motion of the noise and/or mouth can be used to infer an estimate of respiration rate, which can be used, for example, to assess if the occupant has stopped breathing, or if respiration rate is elevated, which can occur during certain perturbed emotional states or medical emergencies. Monitoring the luminance of the face can be used to assess the appearance of sweat beads, which can be used to assess the occupant's comfort (e.g., determine if the climate controls should be adjusted) and/or fitness level (e.g., occupant is ill and/or experiencing a medical event). In addition, the intensity of the light source 122 may be altered to compensate for ambient light, to minimize the visibility of the light source 122, and/or to adjust for the skin tone of the occupant within the imaging area. Spectral analysis of the signal collected from the camera can be used to derive and/or estimate physiological response such as skin heating/cooling and/or electrocardial activity and rates. A wide range of occupant information parameters can be monitored to derive or estimate a wide range of occupant states, which, for example, can be used to establish unique health and behavior characteristics for individual occupants that can enhance the safety, health, comfort and convenience of the driver and other occupants.

In certain implementations, the processor 202 can output a signal based on the occupant state. In some implementations, the output signal can be the image signal corrected for the angle of rotation of the steering wheel assembly 104 and/or the rate of angular rotation of the steering wheel assembly 104. The output signal can also be instructions to adjust the imaging unit 108 to correct for the angle of rotation of the steering wheel assembly 104 and/or the rate of angular rotation of the steering wheel assembly 104, as discussed above. The output signal(s) can also be used by other vehicle systems to establish baseline occupant characteristics (e.g., health, attention, behavior), establish thresholds for actuating other vehicle systems (e.g., control, warning systems), and provide real-time occupant state features that can be compared against actuation thresholds.

The output signal can comprise an electrical signal, a wifi signal, or the like. The output signal can be output to another vehicle system to provide information about the occupant state to that vehicle system. In some implementations, the output signal can be provided to another vehicle system that can, for example, change vehicle parameters based on the driver state (e.g., adjust the sensitivity of the steering wheel, brakes and/or accelerator, turn on or off music, adjust the volume of music, change the type of music, turn on/off interior lights, adjust the cabin temperature, inject a smell, adjust the wavelength and/or intensity of light being emitted by the light source 122, reduce or remove degrees of freedom for the operation of the vehicle from the driver, notify emergency services, modify thresholds of automation, etc.).

And, in some implementations, the output signal may include instructions for OMS 100 or another vehicle system to illuminate or alter the intensity of a light source, play a sound, and/or provide tactile feedback to the driver or other occupant via a haptic feedback device (e.g., vibration, heat, cooling, etc.). The light, sound, and/or haptic feedback may be used to warn the driver or other occupant, for example. In one implementation, the light to be illuminated may include a light bar system, which may part of or the same light bar 124 described above or a separate light bar disposed on another portion of the steering wheel assembly or elsewhere in the vehicle. Exemplary light bar systems are described in co-pending U.S. patent application Ser. No. 14/061,397 entitled “Steering Wheel Light Bar” and filed on Oct. 23, 2013, Ser. No. 14/061,383 entitled “Steering Wheel Light Bar” and filed on Oct. 23, 2013, and Ser. No. 14/061,408 entitled “Steering Wheel Light Bar” and filed on Oct. 23, 2013 and U.S. provisional patent application 62/027,969 entitled “Steering Grip Light Bar Systems” filed Jul. 23, 2014. These four applications are hereby incorporated by reference in their entirety. The haptic feedback device may include a heater pad disposed around the rim of steering wheel assembly or a vibratory exciter (e.g., a speaker) disposed within the rim or hub of the steering wheel assembly, for example.

Before, after and/or during analysis of the image signal received from the imaging unit 108, the processor 202 can be used to adjust the imaging unit 108 and/or received image signal based on the status of the steering wheel assembly 104. The processor 202 may also be used to adjust the light source 122 based on the status of the steering wheel assembly 104. As will be described in more detail below, the processor 202 can analyze an electrical signal from the steering angle sensor 128 to obtain information about the angle of rotation of the steering wheel assembly 104 and/or the rate of angular rotation of the steering wheel assembly 104 and adjust the imaging unit 108 image signal based on that information. For example, the processor 202 can receive an electrical signal from the steering angle sensor 128 and process the electrical signal to identify the orientation/angle of rotation of the steering wheel assembly and/or the rate of angular rotation of the steering wheel assembly. The received signal from the steering angle sensor 128 may be analyzed to adjust the imaging unit 108 and/or the image signal to compensate for the angle of rotation of the steering wheel assembly 104 and/or the rate of angular rotation of the steering wheel assembly 104. For example, the imaging unit 108 may be adjusted to rotate or zoom in or out based on the signal from the steering angle sensor 128. In another example, the image signal captured that corresponds to the imaging area 110 may be adjusted to correct for the angle of rotation of the steering wheel assembly 104 and/or the rate of angular rotation of the steering wheel assembly 104.

Adjusting the imaging unit 108 and/or light source 122 to correct for the angle of rotation of the steering wheel assembly 104 and/or the rate of angular rotation of the steering wheel assembly 104, can include, for example, accounting for a change in geometry between the imaging unit 108 and the occupant, such as the driver, adjusting the shutter speed and/or frame rate of the camera 120, adjusting the intensity of the light being emitted from the light source 122, adjusting which light source 122 is active at a given time, adjusting the angle of the camera lens, adjusting the gain, focus and/or optical filter of the camera 120, adjusting the wavelength or range of wavelengths of light emitted from the light source 122, and the like, or a combination thereof.

The image signal captured that corresponds to the imaging area 110 can also be adjusted to correct for the angle of rotation of the steering wheel assembly 104 and/or the rate of angular rotation of the steering wheel assembly 104. Adjusting the image signal can include, for example, adjusting the contrast of the image signal, adjusting the orientation of the image signal, adjusting the gain of the image signal, accounting for a change in geometry between the imaging unit and the driver or other occupant (e.g., transforming the coordinate system of the image signal), accounting for distortion and/or blur in the image signal, and the like.

The analysis of the image signal from the imaging unit 108 and/or the electrical signal output from the steering angle sensor 128 is described above as being carried out by processor 202. However, in other implementations, the functions described above may be carried out in whole or in part on one or more additional processors and/or processing units. For example, the OMS 100 can comprise one or more additional processing units and/or processors.

In some implementations, the OMS 100 can further comprise a disabling unit configured to temporarily disable all or some of the OMS 100 operations when a driver signal is received. The driver signal can be indicative of the driver performing some operation that would prevent proper operation of the OMS 100. The driver signal can include, for example, a signal output upon rotation of the steering wheel assembly 104 of the vehicle by at least a predetermined amount and/or for a predetermined amount of time. For example, the driver signal can be output when the driver rotates the steering wheel assembly 104 to turn the vehicle. The signal indicating rotation of the steering wheel assembly 104 can, for example, be obtained from the steering wheel assembly angle sensor 128. The driver signal can, in some implementations, cease to be output when the steering wheel is returned to a substantially central position for at least a predetermined amount of time. For example, the driver signal can cease to be output when the driver has completed the turn of the corner and resumed normal driving.

The rate and/or angle of rotation of the steering wheel assembly can also be determined by analyzing sequential signals from the camera to monitor the change in position of reliable, fixed features of the vehicle within the imaging area 110 (e.g., position of doors, position of windows, position of roof). Furthermore, such reliable, fixed features can be added to the vehicle within the imaging area to function as reference features to be used by the OMS 100. For example, optically transparent, but IR visible symbols or shapes can be placed on the vehicle seat, headliner, and/or seat belt, in an a priori pattern, which can be used by the OMS 100 to derive the angle of rotation of the steering wheel assembly.

In some implementations, the OMS 100 can communicate data through an automotive clock spring, such as the automotive clock spring 50 described in relation to FIGS. 6-9 below. Exemplary automotive clock springs include a rotary-type electrical connection that permits rotation of the rotatable portion of the steering wheel assembly 104 while maintaining an electrical connection between vehicle system components disposed on the rotating portion of the steering wheel assembly 104 and components disposed outside of the rotating portion. In certain implementations, the automotive clock spring can be used to electrically couple the imaging unit 108 to at least one other vehicle system during rotation of steering wheel assembly 104. Furthermore, the clock spring can also electrically couple the imaging unit 108, the light source 122, and the steering angle sensor 128 to a power source, such as the vehicle battery, and/or a processing unit 200 disposed outside of the rotating portion of the steering wheel assembly.

FIGS. 6-10 illustrate various implementations of automotive clock spring 50 that may be electrically coupled to the vehicle occupant imaging system 109. In particular, FIG. 6 illustrates a front view of the automotive clock spring 50. The clock spring 50 includes a rotor 54 and a stator 52. The rotor 54 is fixed relative to the rotatable portion of the steering wheel assembly 104. In the implementation shown in FIG. 6, the rotor 54 includes a central aperture 55 for receiving the steering shaft 107 to couple the rotor 54 to the steering shaft 107. The steering shaft 107 and the rotor 54 are configured to rotate together about axis B, which extends through the aperture 55. The stator 52 is disposed radially outwardly of the rotor 54 and is statically coupled to the steering column 106 or another non-rotating portion of the steering assembly 104.

The clock spring 50 further includes processor 202 a disposed in the rotor 54, processor 202 b disposed in the stator 52, steering angle sensor 128 disposed in the stator 52, a set of wires 58 extending between and electrically coupling processors 202 a and 202 b, electrical connectors 56 a, 56 b disposed on a face of a housing of the rotor 54, wires 62 a, 62 b extending between the electrical connectors 56 a, 56 b, respectively, and the processor 202 a, and an electrical connector 60 disposed on a face of a housing for the stator 52.

In the implementation shown in FIG. 6, the steering angle sensor 128 is disposed in the housing of the stator 52. The steering angle sensor 128 is electrically coupled to the set of wires 58 that electrically couple the processors 202 a and 202 b. Thus, the angle of rotation or rate of angular rotation captured by the steering angle sensor 128 may be electrically communicated to the processor 202 a or processor 202 b via wires 58. According to other implementations (not shown), as noted above, the steering angle sensor 128 may be disposed in the housing of the rotor 54 or between another set of non rotating and rotating components of the steering wheel assembly.

The implementation in FIG. 6 also includes electrical connectors 56 a, 56 b disposed on the face of the housing of the rotor 54. The connectors 56 a, 56 b are configured for receiving mating connectors from the imaging unit 108 and light source 122, which, as described above, are disposed on a rotating portion of the steering wheel assembly 104. In one implementation, the electrical wires from the imaging unit 108 and light source 122 may be routed to the electrical connectors 56 a, 56 b through the steering shaft 107 to keep the wires hidden and out of the way of the vehicle operator. The connectors 56 a, 56 b allow for more efficient installation of the imaging unit 108 and the light source 122 onto the steering wheel assembly 104. Furthermore, although only two connectors 56 a, 56 b are shown in FIG. 6, in other implementations, there may be one or more than two connectors. For example, there may be an electrical connector for each imaging unit 108 and light source 122 of the OMS 100.

In some implementations, such as shown in FIG. 9, the connectors 56 a, 56 b are coupled to the processor 202 a via lengths of insulated, electrical wires 86 a, 86 b that extend out of the face of the housing of the rotor 54 (e.g., pigtails) toward the rotation portion of the steering wheel assembly 104.

The set of electrical wires 58 may be coupled adjacent each other via a flat tape 59 that includes the electrical wires 58 separated by a dielectric material 57. The electrical tape 59 is configured to wrap and unwrap around the rotor 54 during rotation of the steering wheel assembly without losing a connection between the processors 202 a, 202 b and without breaking the wires within the tape 58. The image signals or calculated data electrically communicated through the wires 58 of the tape 59 may also be communicated to another processing unit 200 of the OMS 100 disposed outside of the clock spring 50 or another vehicle system disposed outside of the clock spring 50 via the electrical connector 60 disposed on the housing of the stator 52. The stator connector 60 and the wires 58 of the tape 59 may also be used to electrically communicate data and/or signals between components mounted on the rotating portion of the steering wheel and other vehicle systems, such as cruise control, air bag and vehicle safety systems, steering heating control, audio and user communication systems, and the dynamic stability control system. Furthermore, processed image signals and/or data related thereto may be communicated by processor 202 a and/or 202 b to other vehicle systems, such as, for example, vehicle safety systems, user communication systems, and in-vehicle and external passive sensors (e.g., passenger/driver occupant sensor(s), rear occupant sensor(s), reverse camera, external radars, etc.). And, in a further implementation, processor 202 a and/or 202 b may receive data from these other vehicle systems. The data received by the processor 202 a and/or 202 b may be used by the processor 202 a, 202 b to identify which portions of the image signal should be selected and processed further and/or communicated to these systems or other vehicle systems.

The depth of the clock spring 50 may be increased as compared to conventional clock springs to accommodate the addition of one or more of processors 202 a, 202 b into the clock spring 50, according to certain implementations. For example, in one implementation, the depth of the clock spring 50, which extends in a direction parallel to the rotational axis of the rotor 54, is increased from about 30 millimeters to between about 60 and about 70 millimeters. The diameter of the clock spring 50 is kept generally the same as convention clock springs so as to fit within the steering column 106 of the vehicle.

In one implementation, the tape 59 may include eight wires 58, or traces, laid out side by side and separated by dielectric material 57. The dielectric material 57 shields the wires 58 from electrical interference with each other and other components in the clock spring 50 and steering column 106. The tape 59 is wound tightly around the rotor 54 about 3.5 turns to allow the steering wheel assembly 104 to be rotated and the tape 59 to unwind and wind with the rotation of the steering wheel assembly 104. However, in other implementations, the tape 59 may include more than or less than eight wires 58 and may be wound one or more turns around the rotor 54, depending on the anticipated rotational movement of the steering wheel assembly 104. In addition, there may be more than one tape 59 extending between the rotor 54 and the stator 52. Generally, the number and nature of the wiring is based on wire gauge and/or the type of components mounted on the rotatable portion of the steering wheel assembly 104, such as, for example, the OMS 100 components, driver air bag system, steering wheel heating system, human machine interface systems (e.g., switches and/or touch sensitive surfaces configured for receiving input from a user), the light bar feedback system, and the horn.

Processors 202 a and 202 b each include a plurality of stacked, arcuate-shaped, printed circuit boards. The arcuate shape of the processor 202 a, 202 b allows them to fit within the rotor 54 and stator 52 of the clock spring 50 without interfering with the rotation of the rotor 54 and movement of the wires 58 between the rotor 54 and stator 52. And, stacking the printed circuit boards provides sufficient surface area for the processors 202 a, 202 b to perform the functions described herein. However, in other implementations, there may be only one arcuate-shaped printed circuit board or the printed circuit boards may be flat and/or not stacked.

Processors 202 a and 202 b are similar to processor 202 and separately or together may perform one or more functions of processor 202 described above, according to various implementations. The functions to be performed by each processor 202 a, 202 b, may be selected based on several factors, including, for example, the rate at which the image signals are being captured, the size of the image signals, the number of imaging units 108 and light sources 122 disposed on the rotating portion of the steering wheel assembly 104, and the ability of the housing and/or the steering wheel assembly 104 to dissipate thermal energy from the heat generating components. For example, in certain implementations, the processor 202 a may be configured for electrically receiving image signals captured by the imaging unit 108 and selecting at least a portion of the image signals for communicating to the processor 202 b; electrically receiving at least one of an angle of rotation or rate of angular rotation of the steering wheel assembly 104 from the steering angle sensor 128 and adjusting an orientation of the image signals based on the received angle of rotation or rate of angular rotation; electrically receiving at least one of an angle of rotation or rate of angular rotation of the steering wheel assembly 104 from the steering angle sensor 128 and adjusting the imaging unit 108 based on the received angle of rotation or rate of angular rotation; compressing the selected image signals prior to communicating the image signals to the processor 202 b; controlling an amount of light emitted from the light source 122; and saving at least a portion of the selected image signals to a memory. In some implementations, selecting at least a portion of the image signals for communicating to the processor 202 b includes identifying and selecting one or more portions of the image signal related to one or more occupant information parameters.

Furthermore, in certain implementations, the memory may be disposed on the printed circuit board(s) in the rotor 54, elsewhere in the rotor 54, outside of the rotor 54 (e.g., in the stator 52 or in another portion of the vehicle), or a combination thereof.

In other implementations, the processor 202 a may be configured for selecting at least a portion of the image signals related to occupant information parameters, calculating data from the selected signals, and communicating the calculated data to the processor 202 b.

In yet another implementation, which is shown schematically in FIG. 10, a processor 202 c may be disposed adjacent the imaging unit 108. This processor 202 c may be configured for electrically receiving image signals captured by the imaging unit 108 and selecting at least a portion of the image signals for communicating to processor 202 a and/or calculating data from the selected signals.

In addition, in an implementation in which processor 202 a is configured for compressing the image signal prior to communicating the image signal to processor 202 b, processor 202 b may be configured for decompressing the compressed image signals.

Although FIGS. 6 and 9 illustrate the light source 122 as being electrically coupled to the processor 202 a, one or more light sources 122 may instead be coupled to and controlled by the processor 202 b via wires 58 or to other processors disposed in the rotor 54 and/or stator 52, according to other implementations (not shown). For example, one of the connectors 56 a, 56 b may be coupled to processor 202 b via wire 62 b or 86 b and wires 58 such that the light source 122 that is coupled to the connector 56 a, 56 b is electrically coupled to the processor 202 b. In such an implementation, the processor 202 b is configured for controlling the light source 122.

As noted above, processor 202 a may be configured for identifying and selecting at least a portion of the image signals related to one or more occupant information parameters for communicating to the processor 202 b. In certain implementations, the processor 202 b is further configured for smoothing, filtering, and/or analyzing the received image signals.

Processors 202 a and 202 b may also be electrically coupled to a power source disposed within the vehicle via the stator connector 60 and wires 58. Power from the power source is available to the imaging unit 108 and the light source 122 via one or more of the processors 202 a, 202 b according to certain implementations. In other implementations (not shown), power may be available directly to the imaging unit 108 and light source 122 via individual wires coupled to wires 58.

In some implementations, if the physical size of processor 202 a is sufficient to throw the rotation of the rotor 54 off balance, a counter balance may be included in the rotor 54 opposite the processor 202 a to balance the rotational momentum of the rotor 54.

Various implementations provide an improved packaging solution for image detection systems within a vehicle. In particular, by processing the image signal in processor 202 a disposed within the rotor 54 of the clock spring 50, the raw image signal from the imaging unit 108 is received and processed closer to the imaging unit 108, which prevents loss or interference with the signal that may occur over longer distances between the imaging unit 108 and the processor. This arrangement also allows for efficient communication of the image signals used for determining occupant information parameters, which improves the operation of the occupant monitoring system 100. In particular, if the imaging unit 108 is configured to capture image signals at a rate of 60 frames per second, the processor receiving the image signals would need to process 20 megabytes of data every 10 seconds. Such requirements could require a processor that is physically too large to install within a typical clock spring. Furthermore, there are too few wires within typical clock springs to accommodate the transmission at that data transmission rate. Thus, various implementations overcome these constraints by including a first processing unit in the rotor that is configured for selecting at least a portion of the image signals received and communicating the selected portion of image signals (or calculated data from the selected portion of image signals) to a second processing unit outside of the rotor for further processing and analysis.

FIG. 10 illustrates a schematic flow of signals and/or data between various components of the OMS 100 and other vehicle systems through the clock spring 50, according to various implementations. In particular, the light source 122 and the imaging unit 108 are disposed on the rotating portion of the steering wheel assembly 104 and are electrically coupled to processor 202 a disposed on the rotor 54. Other vehicle systems, such as human machine interface systems (e.g., touch pad(s), touch sensitive areas on the steering wheel assembly, and/or switches for interfacing with one or more vehicle systems, such as HVAC, audio, user communication, etc.), heater system for heating the steering wheel, horn activation, and the driver airbag system, may also be disposed on the rotating portion of the steering wheel assembly 104. These systems may be in communication with other processors disposed outside of the rotor 54 via wires 58 extending between the rotor 54 and the stator 52 or in communication with processor 202 a and/or 202 b. Furthermore, as noted above, the processor 202 a or processor 202 b may be further configured for controlling the light source 122. Or in other implementations as depicted by the dotted lines shown in FIG. 10, a separate processor may be disposed in the rotor 54 or stator 52 for controlling the light source 122. Furthermore, signals and/or data from the processors 202 a, 202 b or other processors disposed in the rotor 54 and/or stator 52 and from other systems disposed on the rotating portion of the steering wheel assembly 104 may be communicated to vehicle-side processing units, such as the processing unit(s) of the OMS 100, for further analysis and/or processing.

Although the implementations described above describe the clock spring 50 as used with components of the OMS 100, clock spring 50 may be coupled to other data acquisition systems and/or systems acquiring signals having a relatively high bandwidth. For example, in various implementations, at least one data acquisition unit may be mounted on a rotatable portion of a vehicle steering wheel assembly that is rotatable about a steering column. The first processing unit disposed within the rotor is configured for electrically receiving signals captured by the data acquisition unit and selecting at least a portion of the signals for communicating to a second processing unit. The second processing unit is disposed outside of the rotor in the vehicle (e.g., in the stator or outside of the stator) and is electrically coupled to the set of electrical wires extending between the rotor and the stator. The selected signals are electrically communicated through the set of electrical wires.

In other implementations, such as shown in FIGS. 11A and 11B, a slip ring SR may be used instead of a clock spring to route electrical wires extending between the rotatable portion of the steering wheel assembly 104 and the non-rotatable portions of the steering wheel assembly and/or steering column 106. The slip ring SR includes a rotor portion R and a stator portion S. The rotor portion R is coupled to the rotating portion of the steering wheel assembly 104 and defines a hollow shaft Hr extending around its axis of rotation C. The rotor portion R is engaged within a hollow shaft Hs of the stator portion S such that the rotor portion R can rotate within the hollow shaft Hs of the stator portion S about the axis of rotation C. The stator portion S is coupled to a stationary portion of the steering wheel assembly 104 or steering column 106. The rotor portion R may also include an annular lip A that extends radially outwardly from one end of the rotor portion R and axially engages an outer axial end E of the stator portion S to prevent axial movement of the rotor portion R relative to the stator portion S. The electrical wires from components of the OMS 100 and other systems that may be disposed on the rotatable portion of the steering wheel assembly extend through the hollow shaft Hr of the rotor portion R and are configured to rotate with the rotor portion R.

In some implementations, the OMS 100 can be constructed as a single modular unit. For example, the single modular unit can be a self-contained unit including the camera 120, light source 122, and/or the processing unit 200 or a portion thereof. When constructed as a single modular unit, the OMS 100 can be conveniently packaged and conveniently installed in any steering wheel assembly 104. The single modular unit can be coupled to the steering wheel assembly 104 using any suitable fastening mechanism, such as, for example, screws, hooks, clips, or any other form of mechanical fastener known in the art, or adhesive (e.g., gluing), soldering, welding, or any other fastening technique known in the art. Configuring the OMS 100 as a single modular unit can allow for commonization of the electronics (e.g., integration) and therefore faster electronic communication.

FIGS. 12-20 show various implementations of how various components of the OMS 100 may be coupled to the steering wheel assembly 104. In particular, according to the implementation shown in FIGS. 12-15, the OMS 100 includes a mounting bracket 301, a housing 303, a lens 305, and imaging unit 108. The mounting bracket 301 includes a body 355 to which the imaging unit 108 is coupled and mounting tabs 353, 354 that extend from a lower edge of the body 355. Each tab 353, 354 defines an opening 351, 352, respectively, that aligns with openings defined in an upper area of the frame of the hub 116 of the steering wheel assembly 104. Each set of aligned openings receives a screw 350 to secure the mounting bracket 301 to the hub 116. However, in other implementations, the mounting bracket 301 may be attached to the steering wheel assembly 104 such that it extends upwardly from the central portion 112 using other suitable fastening mechanisms, such as, for example, hooks, clips, or any other form of mechanical fastener known in the art, or adhesive (e.g., gluing), soldering, welding, or any other fastening technique known in the art.

The mounting bracket 301 may be formed of aluminum, a magnesium alloy, steel or other suitable material capable of supporting the OMS 100 components and transferring at least a portion of the heat generated from the components to the frame of the steering wheel assembly 104. The mounting bracket 301 may also be integrally formed or molded with the central portion 112 of the steering wheel assembly 104.

The housing 303 includes a back surface 304 that is disposed adjacent to the back cover 126 of the steering wheel assembly 104, an upper surface 323 that extends transversely to the back surface 304, and side surfaces 324 that extend downwardly from side edges of the upper surface 323 and transversely from the back surface 304. The back surface 304, side surfaces 324, and upper surface 323 define an area therebetween that is configured for fitting around at least a portion of the body 355 of the mounting bracket 301. The upper surface 323 may include fins 325 that extend in the direction from a front perimeter of the housing 303 to the back surface 304 and are distinct and spaced apart from each other in the direction between the side surfaces 323. These fins 325 provide more surface area so as to be a more effective heat sink and provide structural reinforcement for the upper surface 323 of the housing 303.

In the implementation shown in FIG. 17B, the back surface 304 fits flush with, or within the same plane as, the back cover 126 of the steering wheel assembly 104. However, in the implementations shown in FIGS. 18B and 19B, the back surfaces 304′, 304″, respectively, are not flush with the back covers 126′, 126″, respectively, but are disposed in a plane that is spaced inwardly (toward the front of the assembly 104′, 104″, respectively) from the plane that includes the back covers 126′, 126″.

In the implementations shown in FIGS. 12-15 and 17A, the upper surface 323 and side surfaces 324 of the housing 303 define a substantially rectangular shaped perimeter. The perimeter may be slightly arcuate shaped along the upper surface 323 and/or have rounded corners between the upper 323 and side surfaces 324 to blend in aesthetically with the steering wheel assembly 104.

However, in the implementation shown in FIGS. 18A-18B, the upper surface 323′ of the housing 303′ defines a perimeter that includes a rounded, semi-circular central portion 380 that extends upwardly from the steering wheel assembly 104′, and the side surfaces 324′ of the housing 303′ are angled or skewed toward each other and the central portion 380. This shape may blend in aesthetically with the shape of steering wheel assembly 104′ shown in FIGS. 18A and 18B. And, in the implementation shown in FIGS. 19A and 19B, the upper surface 323″ of the housing 303′ defines a perimeter that includes a trapezoidal shaped central portion 385 that extends upwardly from the steering wheel assembly 104″. Side surfaces 324″ of the housing 303″ are angled or skewed toward each other and the central portion 385. This shape may blend in aesthetically with the shape of the steering wheel assembly 104″ shown in FIG. 19A.

The imaging unit 108 is coupled to the mounting bracket 301 adjacent a central portion of the body 355 of the mounting bracket 301. In the implementation shown in FIGS. 13A-15, the imaging unit 108 is camera 120 that includes a lens 320, such as, for example, an adjustable lens or a fixed lens. The camera lens 320 is disposed at a distal end of the camera 120, and light enters the camera 120 via the lens 320. In the implementation shown in FIG. 14, the camera lens 320 is secured to the camera 120 using at least one side set screw 375, and camera 120 is coupled to the mounting bracket 301 using screws 376. However, as noted above, other types of imaging units may be used in other implementations, and other fastening mechanisms may be used to couple the camera 120 to the mounting bracket 301 and/or within the housing 303.

In addition, in some implementations, the light source 122 is coupled to the mounting bracket 301 and is disposed adjacent the imaging unit 108. For example, in the implementation shown in FIGS. 13A-15, the light source 122 includes two printed circuit boards 352 each having four pairs of LEDs 354 disposed thereon. One of the printed circuit boards 352 is coupled to the mounting bracket 301 on a right side of the imaging unit 108, and the other printed circuit board is coupled to the mounting bracket 301 on a left side of the imaging unit 108. A thermal coupling material 330 configured for transferring heat between the printed circuit board and the mounting bracket 301 is disposed between the printed circuit board and the mounting bracket 301. The thermal coupling material 330 may be a thermal coupling pad, such as a foam pad having thermally conductive materials disposed therein, or a thermal coupling paste, for example. The pad, for example, may include adhesive on both sides for attaching to a back surface of the printed circuit boards and a front surface of base 355 of the mounting bracket 301. In addition to the adhesive or as an alternative to the adhesive, each pad may define openings that align with openings defined in the printed circuit board and the mounting bracket for receiving a screw 350 to secure the pad and the printed circuit board 352 to the mounting bracket 301.

In various implementations, the light emitted from the light source 122 may internally reflect from the lens 305 or otherwise reach the camera lens 320 or other type of imaging unit 108 before passing through the lens 305. To prevent the light from the light source 122 from entering the imaging unit 108 prior to exiting the lens 305, a light blocking material may be disposed between a distal end of the imaging unit 108 and the light source 122. For example, as shown in FIG. 15, a ring 322 of compressible material, such as a polymeric foam, silicone, rubber, etc., may be extend between a distal end of the camera lens 320 and the back surface 307 of the lens 305. The ring 322 is annular shaped to correspond to the outer perimeter of the camera lens 320, but in other implementations, the ring 322 may be shaped to correspond to the perimeter of other types of imaging units 108. The compressible material allows the camera lens 320 to be adjusted (e.g., zoom in or out) in the direction of the lens 305 while maintaining contact with compressible material. In other implementations, the light blocking material may be disposed between the printed circuit boards 352 and the lens 305 to prevent light from the LEDs 354 from being received into the imaging unit 108 prior to exiting the lens 305. In other implementations, the light blocking material may extend between the imaging unit 108 or mounting bracket 301 and the OMS lens 305.

Furthermore, the light blocking material may be secured in position using various fastening mechanisms, such as, for example, screws, hooks, clips, or any other form of mechanical fastener known in the art, or adhesive (e.g., gluing), soldering, welding, or any other fastening technique known in the art, a thread (e.g., a DSLR camera filter ring), and/or a combination thereof.

As shown in FIG. 20, the electrical wires coupling the light source 122 and the imaging unit 108 to at least one processor and/or power source may be extended from the central portion 112 of the steering wheel assembly 104 through the opening in the back cover 126 configured for coupling to the steering shaft 106. As noted above, the wires may be electrically coupled to processor 202 a in the rotor 54, processor 202 b in the stator 52 of the automotive clock spring 50, and/or to one or more processors disposed outside of the automotive clock spring 50. Furthermore, in some implementations, the wires may be coupled to processor 202 c disposed within the housing 301, and the processor 202 c may be coupled to the mounting bracket 301 or be otherwise disposed in the housing 301. As noted above, the processor 202 c may be coupled to processor 202 a in the rotor 54 of the automotive clock spring 50 and/or the processor 202 b in the stator 52 of the clock spring 50. And, in some implementations, the processor 202 c may be disposed on one or both of the printed circuit boards 352 shown in FIG. 14. Furthermore, in one implementation (not shown), the OMS 100 may include one printed circuit board on which the processor 202 c and the light source 122 are disposed.

The lens 305 includes a front surface 306, a back surface 307 opposite the front surface 306, an upper perimeter 308, a lower perimeter 310, and side perimeters 309 extending between the upper 308 and lower perimeters 310. The back surface 307 is disposed facing the imaging unit 108, the front surface 306 is disposed facing the interior of the vehicle.

In an implementation in which the imaging unit 108 detects infrared image signals, the lens 305 may be configured for optically blocking visible light and allowing infrared light to pass through the lens 305. For example, the lens 305 may be formed from of poly(methyl methacrylate) (PMMA) or other acrylic-like material. In the implementation shown in FIGS. 12-13B, the lens 305 is formed from ACRYLITE, which is a PMMA, acrylic 1146-0 grade, black material manufactured by Evonik Industries. ACRYLITE is opaque to visible light but allows the transmission of infrared light starting at about 750 nanometers. ACRYLITE also blocks the transmission of ultraviolet light. FIG. 16 illustrates the percentage of light that passes through ACRYLITE at various wavelengths. As shown, no light under about 750 nanometers passes through the ACRYLITE. The lens 305 may further be cut from a sheet of the visible light blocking material or molded to a particular shape.

In other implementations, the lens may be formed from any polycarbonate material, such as, for example, polycarbonate (e.g., LEXAN), acrylonitrile butadiene styrene polycarbonate (ABS-PC), PC-ABS, acrylic-styrene-acrylonitrile terpolymer polycarbonate (ASA-PC), or other plastics that include polycarbonate as a major alloying element. In addition, the lens may be formed from glass, cellulose acetate butyrate (CAB) or butyrate, glycol modified polyethylene terephthalate (PET-G), or other polymers, for example.

Furthermore, in some implementations, an optical film or coating/paint may be applied to one or both of the back surface 307 or front surface 306 of the lens 305 that blocks visible and/or UV light and allows transmission of infrared light.

The lens 305 shown in FIGS. 12-19B are flat, but in other implementations, the lens may be curved.

In the implementations shown in FIGS. 12-19B, a trim piece 340 and a lens support piece 360 are used to prevent movement of the lens 305 relative to the housing 303 and steering wheel assembly 104. In particular, the trim piece 340 includes an upper portion 341 and side portions 342. The upper portion 341 is shaped to follow the shape of the front perimeter of the upper portion 323 of housing 303, and the side portions 342 are shaped to follow the shape of the front perimeter of side portions 324 of the housing 303. The lens 305 is disposed between the front perimeter of the housing 303 and the trim piece 340 to secure the upper perimeter 308 and side perimeters 309 of the lens 305 from movement relative to the housing 303. In addition, the lens support piece 360 has an elongated body and includes an upper surface 361 that defines a channel 362 extending along a length of the elongated body. The lens support piece 360 is disposed adjacent where the mounting bracket 301 is coupled to the steering wheel assembly 104 and extends between the front perimeters of the side portions 342 of the trim piece 340. At least a portion of the lower perimeter 310 of the lens 305 engages the channel 362 to prevent movement of the lower perimeter 310 of the lens 305 relative to the housing 303. The lens support piece 360 may also cover a gap between the central hub 116 of the steering wheel assembly 104 and the lower perimeter 310 of the lens 305. However, in other implementations, the lens 305 may be secured to the housing 303 without any trim or lens support pieces, it may be secured by single or multiple trim pieces, or it may be secured by the housing and the lens support piece without any trim pieces.

The trim piece 340 includes tabs 344 that extend inwardly from each of the side portions 342. Each tab 344 defines an opening 346 that aligns with openings 348 defined through the housing 303 and openings 357 defined through the mounting bracket 301. To secure the trim piece 340 and the housing 303 to the mounting bracket 301, a screw 350 is engaged through aligned openings 346, 348, 357 on each side of the trim piece 340, housing 303, and mounting bracket 301.

The trim piece 340 may be formed of a rigid material, such as a plastic, metal, glass, or ceramic material. In addition, in the trim piece 340 may be dyed, coated, plated, or painted a particular color. For example, in the implementation shown in FIGS. 12-17B, the trim piece 340 is coated, plated, or painted with a chrome color. However, in other implementations, the trim piece 340 may be colored differently, such as colored black or grey to match the housing or the steering wheel assembly.

Similarly, the lens support piece 360 may be formed of similar rigid materials and may also be dyed, coated, plated, or painted a particular color. In addition, the lens support piece 360 may be coupled to the mounting bracket 301 via screws, clips, adhesive, or other suitable fastening mechanism. In the implementation shown in FIGS. 12-15, the lens support piece 360 includes bosses 364 that extend from a lower surface 363 of the lens support piece 360. The bosses 364 define openings that align with openings defined in the mounting bracket 301. A screw 350 is engaged in the aligned opening in the lens support piece 360 and the mounting bracket 301 to secure the lens support piece 360 adjacent the mounting bracket 301. In the implementations shown in FIGS. 12A through 20, various components of the OMS 100 are coupled to the central portion 112 of the steering wheel assembly. By coupling the imaging unit 108 to the central portion 112, such as is described above, the imaging unit 108 is closer to one or more occupants in the vehicle cabin and can thus receive higher resolution image signals of the imaging area than when the imaging unit is disposed further from the occupants in the vehicle, such as on the steering column or elsewhere in the vehicle cabin. Furthermore, coupling the imaging unit 108 to the central portion 112 allows for a greater field of view when the image signals are adjusted based on steering angle or a rate of angular rotation. In addition, by coupling the imaging unit to the rotatable portion of the steering wheel assembly, the field of view of the imaging unit is not further obscured by the rotatable portions of the steering wheel assembly when the position of the steering wheel assembly relative to the driver is tilted upwardly or extended.

In addition, in the implementations described above in relation to FIGS. 12 through 20, the imaging unit 108 is not visible to the driver or other occupants, which prevents the OMS 100 from distracting or intimidating the driver or other occupants. Furthermore, the modularity of the implementations described above in relation to FIGS. 12 through 30 allows the OMS 100 to be integrated more quickly and easily into existing and new steering wheel assemblies 104. By disposing the housing 303 and other components adjacent the back cover 126 of the steering wheel assembly 104, it is easier to route the electrical wires from the OMS 100 components and allows the housing 303 to be coupled to a non-deployable surface, as compared to coupling the components closer to the deployable surface of the driver air bag area. Furthermore, by having the OMS 100 disposed on the upper portion of the hub 116 of the steering wheel assembly 104, the OMS 100 has an unobstructed view of the occupants of the vehicle even during steering wheel assembly rotation, and the OMS 100 is disposed just below the instrument panel in the field of the view of the driver, which may reduce the amount of distraction.

As provided herein, the OMS 100 can be used to monitor a driver or other occupant in a vehicle. Using the OMS 100 to monitor the driver or other occupant can include providing and/or coupling the OMS 100 to the steering wheel assembly 104 of the vehicle. The OMS 100 can include any/all of the OMS 100 components described herein. As outlined above, the OMS 100 can include the imaging unit 108 configured to capture an image signal corresponding to imaging area 110 in the vehicle, where the imaging area 110 encapsulates the driver and/or other vehicle occupant. The imaging unit 108 can be configured to rotate with the central portion 112 of the steering wheel assembly 104. The steering wheel assembly 104 can be configured to rotate relative to the vehicle's steering column 106.

Monitoring the driver and/or occupant can further include capturing an image signal corresponding to the imaging area 110 in the vehicle and processing the image signal to identify an analysis region. The analysis region can be analyzed to determine an occupant information parameter, and the occupant information parameter can, in turn, be analyzed to determine an occupant state. An output signal can then be provided based on the determined occupant state. In some implementations, the OMS 100 can further include a processing unit 200 to perform one or more of the processing, analyzing and outputting steps of the OMS 100. The vehicle can also include a processing unit 200 separate from the OMS 100 where one or more of the processing, analyzing and outputting steps of the OMS 100 are performed by this (remote) processing unit 200.

While the foregoing description and drawings represent the preferred implementation of the present invention, it will be understood that various additions, modifications, combinations and/or substitutions may be made therein without departing from the spirit and scope of the present invention as defined in the accompanying claims. In particular, it will be clear to those skilled in the art that the present invention may be embodied in other specific forms, structures, arrangements, proportions, and with other elements, materials, and components, without departing from the spirit or essential characteristics thereof. One skilled in the art will appreciate that the invention may be used with many modifications of structure, arrangement, proportions, materials, and components and otherwise, used in the practice of the invention, which are particularly adapted to specific environments and operative requirements without departing from the principles of the present invention. In addition, features described herein may be used singularly or in combination with other features. The presently disclosed implementations are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims and not limited to the foregoing description.

It will be appreciated by those skilled in the art that changes could be made to the implementations described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular implementations disclosed, but it is intended to cover modifications within the spirit and scope of the present invention, as defined by the following claims. 

What is claimed is:
 1. An illumination system for use with an occupant monitoring system (OMS) for monitoring at least one occupant in a vehicle, the vehicle having a steering wheel assembly configure to rotate relative to a steering column, the illumination system comprising: an infrared light source coupled to a central portion of the steering wheel assembly, the infrared light source directing infrared light within an imaging area of an occupant monitoring system (OMS), wherein the central portion of the steering wheel assembly comprises a hub and spokes, wherein the spokes extend between the hub and a rim of the steering wheel assembly.
 2. The illumination system of claim 1, wherein the infrared light source comprises one or more infrared light emitting diodes (LEDs).
 3. The illumination system of claim 2, wherein the infrared LEDs are thermally coupled to the steering wheel assembly such that heat generated by the infrared LEDs is transferred toward the steering wheel assembly and away from the infrared LEDs.
 4. The illumination system of claim 3, wherein a thermal conductive gap pad is disposed between the infrared LEDs and the hub for transferring heat generated by the infrared LEDs toward the hub and away from the infrared LEDs.
 5. The illumination system of claim 1, further comprising a second infrared light source coupled to the rim of the steering wheel assembly, the second infrared light source thermally coupled to the steering wheel assembly such that heat generated by the second infrared LED is transferred toward the steering wheel assembly and away from the second infrared LED.
 6. An occupant monitoring system (OMS) for monitoring an occupant in a vehicle comprising: an imaging unit coupled to a steering wheel assembly of a vehicle, the imaging unit having a field of view for capturing an image of an imaging area within the field of view, wherein the imaging area encapsulates an expected position of the occupant, wherein the imaging unit is thermally coupled to the steering wheel assembly of the vehicle such that heat generated by the imaging unit is transferred away from the imaging unit to the steering wheel assembly.
 7. The OMS of claim 6, wherein the OMS comprises a housing in which the imaging unit is disposed, the housing comprising a thermally conductive material, and the housing being thermally coupled to the steering wheel assembly.
 8. The OMS of claim 7, wherein a thermally conductive gap pad is disposed between the housing and the steering wheel assembly to transfer heat away from the OMS and to the steering wheel assembly.
 9. The OMS of claim 6, wherein the housing is directly coupled to a mounting bracket comprising a thermally conductive material, and the mounting bracket is directly coupled to the steering wheel assembly, wherein heat generated by the OMS is transferred to the mounting bracket and from the mounting bracket to the steering wheel assembly.
 10. The OMS of claim 9, wherein the steering wheel assembly comprises a hub and spokes that extend between the hub and a rim of the steering wheel assembly, and wherein the mounting bracket is directly coupled to the hub of the steering wheel assembly such that heat generated by the OMS is transferred from the mounting bracket to the hub of the steering wheel assembly.
 11. The OMS of claim 6, wherein the OMS further comprises an infrared light source, the infrared light source being thermally coupled to the steering wheel assembly.
 12. The OMS of claim 11, wherein the imaging unit and the infrared light source are coupled to a hub and/or spokes of the steering wheel assembly, the spokes extending between the hub and a rim of the steering wheel assembly.
 13. The OMS of claim 6, further comprising a second imaging unit coupled to the vehicle having a corresponding field of view for capturing an image of an imaging area within the field of view, the imaging unit encapsulates an expected position of the occupant.
 14. An occupant monitoring system (OMS) for monitoring an occupant in a vehicle, the OMS comprising: an imaging unit for coupling to a steering wheel assembly, the imaging unit having a field of view inside of the vehicle for capturing an image signal corresponding to an imaging area in the vehicle, the imaging area being within the field of view, and a processing unit, the processing unit including a processor and a memory operably coupled to the processor, the memory having computer-executable instructions stored thereon that, when executed by the processor, cause the processor to: monitor an operator interference signal, the operator interference signal associated with an ability of the OMS to monitor the imaging area; in response to the operator interference signal indicating an interference with an ability of the imaging unit to capture the image signal corresponding to the imaging area, disabling one or more operations of the OMS; and in response to the operator interference signal indicating that the ability of the imaging unit to capture the image signal is restored, enabling the one or more operations of the OMS.
 15. The OMS of claim 14, further comprising a steering angle sensor, wherein: the imaging area encapsulates an expected position of the occupant in the vehicle; the imaging unit rotates with a central portion of a steering wheel assembly of the vehicle; wherein the operator interference signal comprises an electrical signal received from the steering angle sensor and monitoring the operator interference signal comprises: processing the electrical signal to determine the angle of rotation of the steering wheel assembly and/or the rate of angular rotation of the steering wheel assembly; and identifying the interference with the ability of the imaging unit to capture the image signal in response to the angle of rotation and/or rate of angular rotation being greater than a threshold angle of rotation and/or threshold rate of angular rotation, respectively.
 16. The OMS of claim 15, wherein identifying the interference with the ability of the imaging unit to capture the image signal further comprises the angle of rotation and/or the rate of angular rotation exceeding the threshold angle of rotation and/or the threshold rate of angular rotation, respectively, for a predetermined time period.
 17. The OMS of claim 14, further comprising one or more fixed infrared reflective materials disposed within the field of view, wherein the instructions further cause the processor to determine an angle of rotation and/or a rate of rotation based on the image signal of the fixed infrared reflective materials.
 18. A method of monitoring an occupant in a vehicle using an occupant monitoring system, the method comprising: coupling an occupant monitoring system (OMS) to a steering wheel assembly of the vehicle such that the OMS rotates with a rotatable portion of the steering wheel assembly, the OMS including an imaging unit configured to capture an image signal corresponding to an imaging area in the vehicle, the imaging area being within the field of view of the imaging unit; processing an angle electrical signal to determine the angle of rotation of the steering wheel assembly and/or the rate of angular rotation of the steering wheel assembly; in response to the angle electrical signal indicating that the angle of rotation and/or the rate of angular rotation has exceeded a threshold angle of rotation or rate of angular rotation, respectively, disabling operation of the OMS; and in response to the electrical signal indicating that the angle of rotation and/or the rate of angular rotation meets or is below the threshold angle of rotation or rate of angular rotation, respectively, enabling operation of the OMS.
 19. The method of claim 18, wherein the angle electrical signal is received from a steering angle sensor.
 20. The method of claim 18, wherein the angle electrical signal comprises a plurality of imaging signals from the imaging unit that are processed to determine the angle of rotation of the steering wheel assembly and/or the rate of angular rotation of the steering wheel assembly, the imaging signals from the imaging unit comprising images of a fixed reflective material within the field of view of the imaging unit. 